Merge pull request #361 from BernardXiong/master

Add cplusplus and sensor framework.

Author: BernardXiong

components/cplusplus/README.md

@@ -0,0 +1,13 @@
+# C++ support for RT-Thread #
+
+This is the C++ component in RT-Thread RTOS. In order to support C++ language, this component
+implement a basic environment, such as new/delete operators.
+
+Because RT-Thread RTOS is used in embedded system mostly, there are some rules for C++ applications:
+1. DOES NOT use exception.
+2. DOES NOT use Run-Time Type Information (RTTI).
+3. Template is discouraged and it easily causes code text large.
+4. Static class variables are discouraged. The time and place to call their constructor function could not be precisely controlled and make multi-threaded programming a nightmare.
+5. Multiple inheritance is strongly discouraged, as it can cause intolerable confusion.
+
+*NOTE*: For armcc compiler, the libc must be enable.

components/cplusplus/SConscript

@@ -0,0 +1,11 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('CPlusPlus', src, depend = ['RT_USING_CPLUSPLUS'], CPPPATH = CPPPATH)
+
+Return('group')

components/cplusplus/crt.cpp

@@ -0,0 +1,27 @@
+#include <rtthread.h>
+#include "crt.h"
+
+void *operator new(size_t size)
+{
+    return rt_malloc(size);
+}
+
+void *operator new[](size_t size)
+{
+    return rt_malloc(size);
+}
+
+void operator delete(void *ptr)
+{
+    rt_free(ptr);
+}
+
+void operator delete[] (void *ptr)
+{
+    return rt_free(ptr);
+}
+
+void __cxa_pure_virtual(void)
+{
+    rt_kprintf("Illegal to call a pure virtual function.\n");
+}

components/cplusplus/crt.h

@@ -0,0 +1,15 @@
+#ifndef CRT_H_
+#define CRT_H_
+
+#include <inttypes.h>
+#include <stdlib.h>
+
+void *operator new(size_t size);
+void *operator new[](size_t size);
+
+void operator delete(void * ptr);
+void operator delete[] (void *ptr);
+
+extern "C" void __cxa_pure_virtual(void);
+
+#endif

components/dfs/filesystems/nfs/dfs_nfs.c

@@ -750,11 +750,12 @@ int nfs_open(struct dfs_fd *file)
         if (file->flags & DFS_O_CREAT)
         {
             if (nfs_mkdir(nfs, file->path, 0755) < 0)
-                return -1;
+                return -DFS_STATUS_EAGAIN;
         }
 
         /* open directory */
         dir = nfs_opendir(nfs, file->path);
+        if (dir == RT_NULL) return -DFS_STATUS_ENOENT;
         file->data = dir;
     }
     else
@@ -766,20 +767,20 @@ int nfs_open(struct dfs_fd *file)
         if (file->flags & DFS_O_CREAT)
         {
             if (nfs_create(nfs, file->path, 0664) < 0)
-                return -1;
+                return -DFS_STATUS_EAGAIN;
         }
 
         /* open file (get file handle ) */
         fp = rt_malloc(sizeof(nfs_file));
         if (fp == RT_NULL)
-            return -1;
+            return -DFS_STATUS_ENOMEM;
 
         handle = get_handle(nfs, file->path);
         if (handle == RT_NULL)
         {
             rt_free(fp);
 
-            return -1;
+            return -DFS_STATUS_ENOENT;
         }
 
         /* get size of file */
@@ -798,7 +799,7 @@ int nfs_open(struct dfs_fd *file)
 
         /* set private file */
         file->data = fp;
-		file->size = fp->size;
+        file->size = fp->size;
     }
 
     return 0;

components/drivers/sensors/SConscript

@@ -0,0 +1,12 @@
+# SConscript for sensor framework 
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c') + Glob('*.cpp') 
+CPPPATH = [cwd, cwd + '/../include']
+
+group = DefineGroup('Sensors', src, depend = ['RT_USING_SENSOR', 'RT_USING_DEVICE'], CPPPATH = CPPPATH)
+
+Return('group')
+

components/drivers/sensors/sensor.cpp

@@ -0,0 +1,135 @@
+#include <stddef.h>
+#include "sensor.h"
+
+/** 
+ * Sensor
+ */
+Sensor::Sensor()
+{
+	this->next = this->prev = NULL;
+	Subscribe(NULL, NULL);
+}
+
+Sensor::~Sensor()
+{
+}
+
+int Sensor::GetType(void)
+{
+    return this->type;
+}
+
+int Sensor::Subscribe(SensorEventHandler_t *handler, void* user_data)
+{
+    this->evtHandler = handler;
+    this->userData = user_data;
+
+    return 0;
+}
+
+int Sensor::Publish(sensors_event_t* event)
+{
+	if (this->evtHandler != NULL)
+	{
+		/* invoke subscribed handler */
+		(*evtHandler)(this, event, this->userData);
+	}
+
+    return 0;
+}
+
+/**
+ * Sensor Manager
+ */
+/* sensor manager instance */
+static SensorManager _sensor_manager;
+
+SensorManager::SensorManager()
+{
+	sensorList = NULL;
+}
+
+SensorManager::~SensorManager()
+{
+}
+
+int SensorManager::RegisterSensor(Sensor* sensor)
+{
+    SensorManager* self = &_sensor_manager;
+    
+    RT_ASSERT(sensor != RT_NULL);
+
+	/* add sensor into the list */
+	if (self->sensorList = NULL)
+	{
+		sensor->prev = sensor->next = sensor;
+	}
+	else
+	{
+		sensor->prev = self->sensorList;
+		sensor->next = self->sensorList->next;
+
+		self->sensorList->next->prev = sensor;
+		self->sensorList->next = sensor;
+	}
+
+	/* point the sensorList to this sensor */
+	self->sensorList = sensor;
+
+	return 0;
+}
+
+int SensorManager::DeregisterSensor(Sensor* sensor)
+{
+    SensorManager* self = &_sensor_manager;
+
+	/* disconnect sensor list */
+	sensor->next->prev = sensor->prev;
+	sensor->prev->next = sensor->next;
+
+	/* check the sensorList */
+	if (sensor == self->sensorList)
+	{
+		if (sensor->next == sensor) self->sensorList = NULL; /* empty list */
+		else self->sensorList = sensor->next;
+	}
+
+	/* re-initialize sensor node */
+	sensor->next = sensor->prev = sensor;
+
+    return 0;
+}
+
+Sensor *SensorManager::GetDefaultSensor(int type)
+{
+    SensorManager* self = &_sensor_manager;
+	Sensor *sensor = self->sensorList;
+
+	if (sensor == NULL) return NULL;
+
+	do
+	{
+		/* find the same type */
+		if (sensor->GetType() == type) return sensor;
+
+		sensor = sensor->next;
+	}
+	while (sensor != self->sensorList);
+
+    return NULL;
+}
+
+int SensorManager::Subscribe(int type, SensorEventHandler_t *handler, void* user_data)
+{
+	Sensor *sensor;
+
+	sensor = SensorManager::GetDefaultSensor(type);
+	if (sensor != NULL)
+	{
+		sensor->Subscribe(handler, user_data);
+		return 0;
+	}
+
+    return -1;
+}
+